During the Dominion War, the Federation deployed a field of cloaked, [[replicator|self-replicating]] mines to block access to the [[Bajoran Wormhole]]. It is unclear whether this event required another special dispensation from the Romulans or the Treaty only applies to [[starship]]s and other crewed vehicles.

During the Dominion War, the Federation deployed a field of cloaked, [[replicator|self-replicating]] mines to block access to the [[Bajoran Wormhole]]. It is unclear whether this event required another special dispensation from the Romulans or the Treaty only applies to [[starship]]s and other crewed vehicles.

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It is uncertain whether or not the Holo-ship in ''[[Star Trek: Insurrection]]'' was a violation of the treaty or an approved use of a cloaking device on a operational starship. What can be seen from the movie is that the design of the ship itself was ''not'' common knowledge so it is entirely possible that the entire [[Ba'ku]] relocation project may have been done in secret and construction of the ship itself a treaty violation.

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It is uncertain whether or not the holo-ship in ''[[Star Trek: Insurrection]]'' was a violation of the treaty or an approved use of a cloaking device on a operational starship. What can be seen from the movie is that the design of the ship itself was ''not'' common knowledge, so it is entirely possible that the entire [[Ba'ku]] relocation project was done in secret, and construction of the ship was a treaty violation.

Under the terms of the treaty, the Federation may not develop or deploy cloaking technology, resulting in a significant tactical disadvantage for Federation starships. What the Romulans gave up in return (if anything) remains unclear.

Exceptions

In 2371, the Romulans agreed to loan one of their own cloaking devices to the Federation and installed it on the USS Defiant. It's use was to be restricted to the Gamma Quadrant under Romulan supervision. In return, the Federation agreed to share all intelligence that the ship acquired in the Gamma Quadrant.

During the Dominion War, the Federation deployed a field of cloaked, self-replicating mines to block access to the Bajoran Wormhole. It is unclear whether this event required another special dispensation from the Romulans or the Treaty only applies to starships and other crewed vehicles.

It is uncertain whether or not the holo-ship in Star Trek: Insurrection was a violation of the treaty or an approved use of a cloaking device on a operational starship. What can be seen from the movie is that the design of the ship itself was not common knowledge, so it is entirely possible that the entire Ba'ku relocation project was done in secret, and construction of the ship was a treaty violation.